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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59ebca3cdfb05f9ba5dec285ab0d534c07b74cf970bb5a0a2cac657b64b2fe2e' 
  AND token = 'xNTPzsFgTE/bbOtVWm4yNvQ5WHstfCo+EaMwNZCfBg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}